v3.24.1.1.u2

Leases - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) branch location	Dec. 31, 2023 USD ($)
Lessee, Lease, Description [Line Items]
Number of full service branches | branch	4
Number of other locations | location	4
Weighted average discount rate	3.87%	3.79%
ROU assets	$ 3,013	$ 3,587
Present value of net future lease payments	$ 3,494	$ 3,791
Minimum
Lessee, Lease, Description [Line Items]
Remaining term of contract	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining term of contract	9 years

X

- Definition

Lessee, Operating Lease, Number Of Full Service Branches

+ References

No definition available.

+ Details

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Namespace Prefix:	cbnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Lessee, Operating Lease, Number Of Other Locations

+ References

No definition available.

+ Details

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Namespace Prefix:	cbnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Lessee, Operating Lease, Remaining Term Of Contract

+ References

No definition available.

+ Details

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Namespace Prefix:	cbnk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Operating Lease, Right-Of-Use Asset, Net

+ References

No definition available.

+ Details

Name:	cbnk_OperatingLeaseRightOfUseAssetNet
Namespace Prefix:	cbnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

+ Details

Name:	us-gaap_OperatingLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479589/842-20-55-53

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (g)(4)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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- Details

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